Rafi Uzzaman

Pawzeeble - Backend Engineer

Remote, January 2022 - May 2025

• Redesigned backend architecture with a senior engineer to improve code modularity and ease future feature expansion across clinic and pet-parent features.
• Refactored and optimized complex Mongoose schemas and query logic to handle high-volume traffic efficiently, significantly improving read operations.
• Migrated backend codebase from JavaScript to TypeScript, introducing strong typing and custom migration scripts for seamless data transformation and validation.
• Integrated transactional communication services:
  • SendGrid for email notifications (templated and dynamic)
  • TextLocal for SMS alerts
  • Inerakt WhatsApp for real-time customer engagement
• Secured file storage architecture:
  • Configured AWS S3 buckets with restricted access
  • Enabled secure file sharing via presigned URLs for temporary access to private documents
• Managed and deployed backend applications to AWS EC2 servers via SSH:
  • Handled update rollouts
  • Resolved disk space, log bloat, and process crash issues
• Collaborated with frontend and QA teams to ensure API stability, backward compatibility, and data consistency across staging and production environments.

Freelance - Full-Stack Developer

Remote, August 2019 - January 2022

Overview:

Worked with various clients to deliver full-stack web applications. Focused on React for frontend and Node.js/Express with MongoDB for backend. Projects ranged from converting designs to code, modernizing legacy applications, building admin panels, and deploying secure backend services.

• Breeyz (React + Figma Integration)

  • Converted pixel-perfect Figma designs into modular, reusable React functional components.
  • Used React Hooks (useState, useEffect) for managing local state across complex UI flows.
  • Ensured full mobile responsiveness and cross-browser compatibility.
  • Applied atomic design principles to maintain scalable component structure.

• Three.js-based Website (Legacy Modernization)

  • Migrated a complex AJAX-based interactive website to a modern React/Redux architecture.
  • Integrated a Three.js wrapper to retain and improve 3D visualizations in React.
  • Separated logic from presentation layer to make future updates more maintainable.
  • Enhanced performance by reducing re-renders and optimizing canvas animation lifecycles.

• Live101 (React Feature Development)

  • Collaborated with in-house team to build and extend UI components for a React production app.
  • Diagnosed and resolved layout, state synchronization, and responsiveness issues.
  • Followed component-based architecture to align with broader project structure.
  • Ensured seamless component communication via props and centralized state logic.

• nhplus.in (Bug Fixing & UI Enhancement)

  • Added new user-facing features using React; fixed issues in navigation, forms, and data handling.
  • Refactored legacy components for better reusability and maintainability.
  • Worked with designers to align frontend behavior with intended user experience.
  • Conducted manual and browser compatibility testing.
• ATGKhidmat.com (Custom Full-Stack CMS)
  • Developed a product catalog website from scratch using HTML, CSS, JavaScript.
  • Built RESTful backend using Node.js, Express, and Mongoose for handling:
    • Contact form submissions
    • Admin CRUD operations for:
      • Hero banners
      • Product image uploads
      • Catalogue PDF management
      • Sub-admin user roles
  • Deployed frontend on Netlify, backend hosted independently (Node + MongoDB).
  • Added dynamic animations for better user engagement and visual hierarchy.
  • Secured backend routes with custom middleware and access controls.